TiO2/rGO composite material having high-efficiency electrocatalytic oxygen reduction performance

A composite material and electrocatalytic technology, applied in the field of electrocatalytic materials, can solve problems such as not having electrocatalytic oxygen reduction performance

Inactive Publication Date: 2015-05-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-TiO prepared by existing methods 2 Graphene composites do not have electrocatalytic oxygen reduction properties

Method used

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  • TiO2/rGO composite material having high-efficiency electrocatalytic oxygen reduction performance
  • TiO2/rGO composite material having high-efficiency electrocatalytic oxygen reduction performance
  • TiO2/rGO composite material having high-efficiency electrocatalytic oxygen reduction performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol, 3.00mL of ethylene glycol stock solution (pure ethylene glycol), slowly add 10.00mL of tetrabutyl titanate, and stir for 5 min to form Light yellow transparent liquid, add 0.867g of ammonium fluoride, 1.406g of urea, 2mL of graphene oxide (1g / 100mL), stir until the solution is clear (about 5 min), and finally add 16.00mL of 6mol / L hydrochloric acid dropwise, stir well Finally, transfer the reaction solution into a 100mL autoclave, heat to 200°C, take it out after 10 hours at constant temperature, wash the product three times with absolute ethanol, then wash three times with twice distilled water, and put it in a vacuum distillation device at 50°C Distill under reduced pressure for 20 minutes to obtain a black powdery solid, which is TiO with high-efficiency electrocatalytic oxygen reduction performance. 2 / rGO composite material——TiO 2 / (1.5%) rGO.

[0041] Characterized...

Embodiment 2

[0043] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol and 3.00mL of ethylene glycol stock solution, slowly add 10.00mL of tetrabutyl titanate as the raw material, stir for 5min, a light yellow transparent liquid is formed, add fluoride Ammonia 0.867g, urea 1.406g, graphene oxide 4mL (1g / 100mL), stir until the solution is clear (about 5 min), and finally add 6mol / L hydrochloric acid 16.00mL dropwise, after fully stirring, transfer the reaction solution to 100 In a 1 mL high-pressure reactor, heat to 200 ° C, take it out after 10 hours at constant temperature, wash the product three times with absolute ethanol, and then wash three times with double distilled water, put it in a vacuum distillation device for 20 minutes under reduced pressure at 50 ° C, A black powdery solid is obtained, which is TiO with high-efficiency electrocatalytic oxygen reduction performance. 2 / rGO composite material——TiO 2 / (3.0%) rGO.

[0044] Charact...

Embodiment 3

[0046] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol and 3.00mL of ethylene glycol stock solution, slowly add 10.00mL of tetrabutyl titanate as the raw material, stir for 5min, a light yellow transparent liquid is formed, add fluoride Ammonia 0.867g, urea 1.406g, graphene oxide 6mL (1g / 100mL), fully stir the solution until it becomes clear (about 5 min), and finally add 6mol / L hydrochloric acid 16.00mL dropwise, after fully stirring, transfer the reaction solution into 100ml In a high-pressure reaction kettle, heated to 200°C, took it out after constant temperature for 10 hours, washed the product three times with absolute ethanol, then washed three times with double distilled water, put it in a vacuum distillation device for 20 minutes under reduced pressure at 50°C, and obtained Black powdery solid, which is TiO with high-efficiency electrocatalytic oxygen reduction performance 2 / rGO composite material——TiO 2 / (4.5%) rGO....

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Abstract

The invention relates to a TiO2/rGO composite material having the high-efficiency electrocatalytic oxygen reduction performance, and belongs to the technical field of an electrocatalytic material. According to the composite material, anatase phase modified nano-TiO2 (N and F are co-doped in nano-TiO2 crystal lattices) is attached onto the surface of reduced graphene oxide, wherein the mole content of the reduced graphene oxide is 1.5-4.5%, and the mole contents of N and F in the modified nano-TiO2 are 1.07-1.19% and 0.95-1.04% respectively. Compared with simple modified nano-TiO2, the composite material has the high electrocatalytic oxygen reduction performance in an oxygen-saturated 0.1M KOH solution, the onset oxidation potential is about -0.2V, and the maximum oxygen reduction current can reach 10<-5>mA.cm<-2>. Besides, the composite material has the advantages of stable electrocatalytic oxygen reduction performance and high selectivity.

Description

technical field [0001] The invention relates to a TiO with high-efficiency electrocatalytic oxygen reduction performance 2 The / rGO composite material belongs to the technical field of electrocatalytic materials. Background technique [0002] A fuel cell is a power generation device that directly and continuously converts the chemical energy present in chemical fuels and oxidants into electrical energy. focus on. For alkaline fuel cells, the oxygen reduction performance of cathode materials is a key technology restricting its development. Generally speaking, the electrochemical oxygen reduction reaction has different reaction mechanisms due to different electrode materials, surface properties, and solution pH values. Generally, it can be divided into two-electron reactions, direct four-electron reactions, and two-step two-electron (2+2) reaction processes. , is considered as an ideal oxygen reduction pathway because the four-electron reaction process can obtain more elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18H01M4/90
CPCY02E60/50
Inventor 于洁玫黄太仲刘宗明张以河翟利民
Owner UNIV OF JINAN
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